Make sure you don't have two firewalls running. Running multiple firewalls on the same connection can cause issues with Internet connectivity. If you're using a second firewall, disable the Windows firewall.

Disable your firewall temporarily to see if you can email in Picasa.

Successful email: If you can email with the firewall disabled, your firewall is the problem. Consult the help resources for your firewall.

Failed email: If you still can't email with the firewall disabled, please move on to the next step.

Please be advised that you'll want to re-enable your firewall after trying this step.

Step 4: Make sure that your browser accepts cookies

In order to send photos using Gmail, you need to make sure that your browser is set to allow cookies. If Gmail can't set a cookie, you won't be able to sign in through Picasa. Please follow these steps to make sure that cookies are enabled in your browser.

Make sure you don't have two firewalls running. Running multiple firewalls on the same connection can cause issues with Internet connectivity. If you're using a second firewall, disable the Windows firewall.

Disable your firewall temporarily to see if you can email in Picasa.

Successful email: If you can upload with the firewall disabled, your firewall is the problem. Consult the help resources for your firewall.

Failed email: If you still can't upload with the firewall disabled, please move on to the next step.

Please be advised that you'll want to re-enable your firewall after trying this step.